如何透過html5實現搖一搖的功能-H5教程-PHP中文網

如何透過html5實現搖一搖的功能

jacklove

發布： 2018-06-09 10:04:08

原創

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原則：使用DeviceMotion實現，關於DeviceMotion介紹可以查看
https://developer.mozilla.org/en-US/docs/Web/Reference/Events /devicemotion

透過DeviceMotionEvent，可以得到accelerationIncludingGravity的x,y,z屬性，根據x,y,z屬性的變化來判斷裝置是否有搖一搖的事件發生。

accelerationIncludeingGravity說明：
The acceleration of the device. This value includes the effect of gravity, and may be the only value available on devices that don't have aallow roscope to them to properly remove gravity from the data.

程式碼如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html>
 <head>
  <meta http-equiv="content-type" content="text/html;charset=utf-8">    
  <title> html5使用DeviceMotionEvent实现摇一摇 </title>
  <style type="text/css">
  .center{position:absolute; width:640px; height:480px; left:50%; top:50%; margin-left:-320px; margin-top:-240px; line-height:480px; text-align:center; font-size:100px; }
  .normal{background:#000000;}
  .normal .txt{color:#FFFFFF;}
  .doing{background:#FF0000;}
  .doing .txt{color:#FFFF00;}
  </style>
 </head>
 <body id="mybody" class="normal">
    <p id="txt" class="txt center">请执行摇一摇</p>
 </body>
 <script type="text/javascript">
    var doing = 0;  // 判断是否在动画显示中
    var speed = 23; // 定义摇动的速度数值
    var lastx = 0;    var lasty = 0;    var lastz = 0;    function handleMotionEvent(event) {
        var x = event.accelerationIncludingGravity.x;        var y = event.accelerationIncludingGravity.y;        var z = event.accelerationIncludingGravity.z;        if(doing==0){            if(Math.abs(x-lastx)>speed || Math.abs(y-lasty)>speed){
                doing = 1;
                show();
            }
        }
        lastx = x;
        lasty = y;
        lastz = z;
    }    function show(){
        document.getElementById(&#39;mybody&#39;).className = &#39;doing&#39;;
        document.getElementById(&#39;txt&#39;).innerHTML = &#39;执行了摇一摇&#39;;
        setTimeout(function(){
            doing=0; 
            document.getElementById(&#39;mybody&#39;).className=&#39;normal&#39;;
            document.getElementById(&#39;txt&#39;).innerHTML = &#39;请执行摇一摇&#39;;
        },3000);
    }
    window.addEventListener("devicemotion", handleMotionEvent, true); </script></html>

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